Please forgive and ignore if this is just so much more extra gluck. Narrative or ancedotal info is all I have at this pt to offer but maybe it turn out useful -- something in it strike a note, spark an idea, jostle a memory, help get a connection made? Lead to something specific. Again, if not, ignore please (read please do not mock, flame, what have you. Thanks in advance.)
Troubles may be with things connected with firefox, extensions, java, profiles. Should add, ie and ms/windows on the whole. over the past several months I have had troubles surrounding what build of firefox and wordpress attempting to use at any given pt. Where it may work out cleaner and easier for you is where it is murkier and overwhelming, disheartening for me -- assuming you are the only one using your system is what I'm talking about. Whereas, for me, without warning, unexpectedly, I've had episodes of being called away from mine, to return to trying to pick up where I left off with the burden then of trying to remember, retrace steps, and so on, all convulated by, (read screwed) subject to finding out later that someone else - a kid I mentor who doesn't have his own computer but I let come to my place and use as he needs -- "made adjustments" -- taking a breath. Okay, so if you can do everything you need to do to get your firefox profile completely out of the picture and do clean reinstall, no extensions, no profile stuff, no java stuff carrying over, just basic clean download with known stable version, and get the same with your wordpress, you might get whatever is having its way with its own agenda out of the mix. Don't know about whatever hotfixes and added crap (if you run ms, that is) you've had to take on from all the ms so-called fixes for so-called security's sake. This last, I add, I suspect as having convaluted things concerning java runtimes associated where and with user profiles over time, that whole foggy mess, as this is where my mentoree in trying to help may have unknowingly got some of those hiddens moving in another direction. How I hope something will arise out of this thread to bring these "external entities" into the light and get stuff working together and not at odds.